论文部分内容阅读
报道1994航次南海东北部的226Ra。利用Mn－纤维富集海水中的Ra同位素，采用Mn－纤维直接射气法测量226Ra的比活度，228Ra的比活度采用228Ac的β计数法测量。研究海区226Ra的放射性比活度范围为0．62－1．17Bq·m-3,228Ra／226Ra）A.R介于2.78－4.59。226Ra的表层比活度分布大致表现为该海区东北部较高，中南部也有一较大值，表明陆源物质对这两个区域水体中的226Ra的贡献很大，其它区域分布较均匀。表层228Ra／226Ra）AR分布为靠近珠江口和西南区较高。此外，还将本航次的结果与该海区1992年春季航次的结果进行了比较。
Reported 1994 voyage 226Ra northeast of the South China Sea. Enrichment of Ra isotopes in seawater by Mn-fiber and specific activity of 226Ra by Mn-fiber direct gas-jet method were measured. The specific activity of 228Ra was measured by β count method of 228Ac. The specific activity of 226Ra in the study area ranged from 0.62-1.17Bq · m -3,228Ra / 226Ra). The surface specific activity distribution of AR ranging from 2.78 to 4.59.226Ra showed the higher, middle, There is also a large value in the southern part, indicating that the terrigenous material makes a great contribution to the 226Ra in the water bodies of these two regions, while other regions are more evenly distributed. Surface 228Ra / 226Ra) AR distribution is higher near the Pearl River estuary and southwest area. In addition, the results of this voyage were compared with those of the sea area in the spring of 1992.